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w. P. GIBSON. SAFETY DEVICE FOR ELEVATORS. No. 412,329. Patented Oct. 8,1889.

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' which- "WILLIAM P. GIBSON, OF NEW YORK, N.

PATENT FFIQEQ SAFETY DEVICE FOR ELEVATORS.

SPECIFICATION forming part of Letters Patent No. 412,329, dated OctobrS,1889.

Application filed December 31, 1888.

To all 10700122 it may concern.-

Be it known that I, \VILLIAM P. GIBSON, a citizen of the United States,residing at New York, county of New York, and State of New York, haveinvented certain new and useful Improvementsin Safety Mechanism forElevators, fully described and represented in the followingspecification and the accompanyingdrawings, forming a part of the same.

This invention relates to improvements in connections for automaticallyoperating the safety devices of an elevator.

It is the object of the present invention to provide connections forthis purpose which shall be simple in construction and reliable inoperation, combined with the hoisting-cables and speed-governor deviceof an elevator mechanism in such manner that the safety devices of theelevator may be set into operation to arrest the descent of theelevator-car by said hoisting-cables when any one or more of said cablesbecome broken or slack, or by the speed-governor of the elevatormechanism when from any cause the speed of the elevator-car becomesunduly accelerated in its descent.

To this end the invention consists of certain peculiar arrangements andcombinations of parts, which will now be explained in connection withtheaccompanying drawings, in

Figure 1 is a side elevation of the platform of an elevator-car providedwith my invention. Fig. 2 is aplan View of the under side of the same.

In said drawings there is illustrated only so much of the mechanism ofan ordinary elevator-car and its connections as is necessary for anunderstanding of the invention.

Referring to said drawings, it will be understood that A represents theelevator-plat form, and B the guides by which its movements in theelevator-shaft are guided The platform A is provided upon its under sidewith a wide cross-beam (3, extending across its width and havingprojecting ends in which are formed recesses for embracing loosely theguides B upon each side of the platform. Each recess is provided uponone side of the guide B with a metal wear-plate Serial No. 294,998. (Nomodel.)

1), and upon the opposite side with a wedge E, having an inclined outerface, the adjacent face of its recess being similarly inclined, as shownin Fig. 1.

The cross-beam O is provided at each end near each recess with a curvedbearing F, against which rests a yoke-shaped arm G, the ends of whichare pivotally connected to arms 0 (Z. The arms 0 are pivotally securedin bearings 6 upon the cross-beam O, and the arms cl are made fast torods H, also pivoted in bearingsf upon said cross-beam, and eachcarrying a cam g, upon which rests a finger 71, fast upon a rod 1,turning in bearings 1', secured to the side of the cross-beam G. The rod1 has also fast upon it, at one end of the cross-beam C, a rock-arm K,one end of which is secured to the cable L of the governor apparatus ofthe elevator.

Interposed between the end of the arm K and a guide m in the car is 'aspring n.

The end of the finger h at each end of the cross-beam C enters anopening 8 in thelower end of the wedge E, and when raised and loweredforces said wedge upward and downward in its recess, as hereinafterdescribed. The arm G upon each side of the cross-beam C has also securedto itat o 19, respectively, the rods M N, two upon each side of the car,as shown, said rods passing upward along the sides of the car and beingconnected to the hoistingcables above the car, in the manner shown inUnited States Letters Patent No. 216,013, to C. W. Baldwin, June 3,1879;or, if preferred,

the cables may separate at the top of the car and, passing downward uponthe opposite sides of the car, have their ends secured at 0 p, as iscommon in this class of elevators.

The cable L may be connected to any suitable form of governor providedwith connections for operating clamping or retarding devices, which,when the movement of the car becomes unduly accelerated, will stop orretard the further movementof said cable and cause it to operate theconnections already described to raise the wedges E in their recessesand thus arrest the further movement of the car. A governor andconnections suit able for the purpose is that described in United StatesLetters Patent No, 228,107, to O. R. Otis, May 25,1880, to which LettersPatcut reference will be made in the description of the operation of themechanism heretofore described.

The operation of the mechanism described is as follows: When theelevator-car is traveling at normal speed and with its hoistingcablesintact and taut, the wedges E will rest looselyin their recesses and thesafety appliance remain inoperative, the cable L moving with the car andcommunicating its movement to the governor. When, however, the descentof the elevator-car becomes for any reason accelerated beyond its properspeed, the governor, through suitable clamping devices, with which it isprovided, (for example, those shown and described in the aforesaidLetters Patent,) will retard or stop the further movement of said cableand causeit to rock the arm K, and through the rod I raise the fingers hand wedges E and force said wedges tightly into their recesses. When thewedges E'have been raised to this position, they will bind tightlybetween the beam 0 and the guides B and thereby arrest the furtherdescent of the car. When the car has been thus arrested in its descent,the governor will cease its operation and upon the reverse movement ofthe car release its clamping devices from the cable L and permit saidcable to be returned to its normal position by the spring n. The cable Lin returning to its normal position will rock the arm K downward andthrough the rod 1 rock the fingers h downward and withdraw the wedges.The car will then be free to continue its descent. Should any one of thehoisting-cables become broken or slack, the other cable will draw upwardupon and tilt the arm G, to which it is connected, and through its arm drock the rod H and cause its cam g to rock the rod I and press thefingers h upward and force the wedges E into their recesses, and causethem to wedge tightly between the beam 0 and guides B, and thus arrestthe descent of the car. Suppose, for example,oue or both of the cablesconnected to the bars M should break or become slack. The strain thenbeing increased upon the cables attached to the bars, they will drawupward upon their ends of the arms G, and through the arms d rock therod or rods H, and cause the inner ends of its cam or cams g to pressthe fingers h upward and force the wedges E into their recesses in themanner just described. Should either-or both of the cables attached tothe bars-N break or become slack, the opposite end or ends of the arm orarms G will be raised and the outer end or ends of the cam or cams gpressed against the finger or fingers h, and the wedges E be forcedupward into their recesses.

What I claim is- 1. The combination, with the fingers h and the wedgesfor stopping the car, of the rods H, having the cams g formed to operatesaid fingers when the rods H are rocked in either direction, the arms G,fulcru med uponbearings beneath the car and connected upon oppositesides of said bearings to the respective hoisting-cables and pivotallyconnected at one end to arms d, extending from said rods H,substantially as described.

2. The combination, with the rod I, carryin g fingers h, and the wedgesfor stopping the car, of the rods H, having the cams g formed to operatesaid fingers when the rods H are rocked in either direction, the arms G,fulcrumed upon bearings beneath the car and connected upon oppositesides of said bearings to the respective hoisting-cables and pivotallyconnected at one end to arms (1, extending from said rods H, and the armK, extending from the rodI and connected to the governor-cable L,substantially as described.

3. The combination, with the elevator-car and its guides B, of wedges E,the fingers h, entering openings in the Wedges, so as to move saidwedges in either direction, the rods H, having the cams g formed tooperate said fingers when the rods are rocked in either direction, thearms G, fulcrumed against bearings WVM. P. GIBSON \Vitnesses:

J. J. KENNEDY, EDWARD wool).

